Orange-finned mahseer
Critically endangered freshwater game fish from India.
The orange-finned mahseer is a rare freshwater fish found only in the Kaveri river basin of India. Anglers prize it for its size and strength, but dams and pollution have caused severe population declines. A 2018 study confirmed its scientific identity, aiding conservation efforts.
- Endemic to the Kaveri river basin in India.
- Distinguished by a bright orange caudal fin.
- Listed as critically endangered due to multiple threats.
- Scientific identity confirmed in 2018 to aid protection.
What it is
This fish belongs to the mahseer group within the carp family. It lives in fresh water and is native to the Western Ghats of India. The species has a distinct physical profile, including a prominent hump that starts above the pre-opercle bone. Its mouth is positioned at the end of the snout. The most striking feature is the bright orange colour of its tail fin. These traits help distinguish it from other similar mahseer species.
Where it lives
The orange-finned mahseer is endemic to a specific region in southern India. Its entire known range is restricted to the Kaveri river basin. This area includes the main river and its tributaries within the Western Ghats mountain range. The species does not occur naturally outside this drainage system. Historical records suggest it was once more widespread across the basin before recent population crashes.
How it lives
Anglers regard this fish as a premier sporting catch. It is described as the largest and hardest fighting freshwater fish in the world. This reputation stems from its power and resistance when hooked. While specific dietary habits are not detailed here, its status as a game fish implies it is an active predator or strong swimmer. It shares its habitat with other mahseer species, both native and introduced.
Breeding and life cycle
Specific details regarding spawning seasons, egg laying, or juvenile development are not provided in the available information.
Fish and people
Fishing for this species is popular among sport anglers who value its fighting ability. However, traditional fishing methods like dynamite use have harmed populations. The fish holds significance in recreational angling circles. Recent scientific clarification of its name has helped formalise its protection status. This legal recognition supports ongoing efforts to preserve the species for future generations of fishermen and conservationists.
Status and threats
The species is listed as critically endangered. Several factors threaten its survival. Non-native mahseer species, such as Tor khudree and Tor putitora, have been introduced into its habitat. Dam construction on the Kaveri river and its tributaries disrupts its environment. Other threats include dynamite fishing, loss of riverbank vegetation, industrial pollution, and water abstraction for irrigation. Climate change affecting monsoon patterns also contributes to population decline. A 2018 study linked the common orange-finned form to the scientific name Tor remadeviae, facilitating better conservation management.
Questions people ask about Orange-finned mahseer
Where does the orange-finned mahseer live?
It is found only in the Kaveri river basin within the Western Ghats of India. It is endemic to this specific freshwater drainage system and does not occur naturally elsewhere.
Why is this fish considered endangered?
Threats include dam construction, pollution, dynamite fishing, and the introduction of non-native mahseer species. Loss of riparian cover and changes in monsoon patterns have also caused significant population declines.
What makes this mahseer unique?
It has a prominent hump above the pre-opercle, a kink in the pre-opercule, and a bright orange tail fin. Anglers also prize it for being a large and hard-fighting game fish.
Good reading and sources
The facts on this page come from the Wikipedia article "Tor remadeviae", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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